The Starbucks promotion, which a Facebook spokesperson characterized as an "experiment," allows users to post messages without forcing them through extra steps.

It's not clear if Starbucks paid Facebook for the placement; Facebook would not comment on commercial arrangements and a Starbucks spokesperson did not respond to a request for comment.

Facebook has admitted its gifts business is desperately small, and CEO Mark Zuckerberg said that analysts should "temper" their projections for the business.

In the fourth quarter, it was some small fraction of a $5 million category of the payments revenue that wasn't related to social games.

"We think Gifts if done well can be a very natural and positive part of the Facebook experience," CFO David Ebersman said in Wednesday's fourth-quarter earnings call. "So, for example, when you're wishing someone a Happy Birthday, the ability to send a gift along with that, and just figuring out how the product needs to work, what the interfaces are, what the selection of products is, how the payment process works?"

So the Starbucks placement and the tweak to allow the old way of writing birthday messages seem right in line with that.

Starbucks and Facebook have a long history of virtual gifting, by the way. Starbucks introduced a "give a gift" feature on Facebook in 2010.

Users, however, don't seem to be in love with it. Here are some examples of negative comments they've made on Twitter:

Facebook asked if I wanted to send you a Starbucks birthday present. I don't.